package com.stillalive.blogsystem.common.util;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtParser;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.security.Keys;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;

import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.util.Map;
@Slf4j
public class JwtUtils {
    private static String SECRET_STRING = "rIl14kcJhASDD7CsJc/XEgIrEmyOg69c/qjFClAujJI=";
    // 两种方式等价
    private static Key key = Keys.hmacShaKeyFor(SECRET_STRING.getBytes(StandardCharsets.UTF_8));
    // private static Key key2  = Keys.hmacShaKeyFor(Decoders.BASE64.decode(SECRET_STRING));
    public static String genToken(Map<String, Object> claims){
        String compact = Jwts.builder()
                .setClaims(claims)
                .signWith(key)
                .compact();
        return compact;
    }

    public static Claims parseToken(String token){
        if(!StringUtils.hasLength(token)){
            return null;
        }
        JwtParser build = Jwts.parserBuilder().setSigningKey(key).build();
        Claims claims = null;
        try{
            claims = build.parseClaimsJws(token).getBody();
        }catch (Exception e){
            log.error("token解析失败，token:" + token);
        }
        return claims;
    }
}
